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p=1
q= -2
a²=9
b²=5
c=2
pusat: (p,q) = (1,-2)
puncak 1 (p+a,q) = (4,-2)
2 (p-a,q) = (-2,-2)
3 (p,q+b)= (1,-2+√5)
4 (p,q-b) = (1,-2-√5)
fokus:
1 (p+c,q) = (3,-2)
2 (p-c,q) = (-1,-2)
persamaan direktriks
x=p+a²/c =1+9/2 = 11/2 dan
x=p-a²/c = 1-9/2 = -7/2
eksentrisitas
e=c/a = 2/3